I'm reposting this with more descriptive info... sorry to those who have already answered, thanks so much for your responses
I have a 3 month old corolla brand new with a warranty and everything, lately i've noticed that if I start the engine it'll idle at 2000RPM. After about 15 seconds it'll start to lower down into the 1000s. One thing to take into account is it has gotten much colder where I live. It used to be 70F degrees in the morning and now it is about 50F. Could this be influencing it? If I start the engine, drive, turn it off, then start it 5 minutes later, it won't do this.
When I shift it into drive (it's an automatic) I kind of feel it kick and it drops down to 1000 RPM. If I put it back into park it is still down at 1000RPM. Is this a problem?
2007-09-19 05:44:47 · 7 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
It's perfectly normal.
In colder weather and cold start (engine cold), the engine pumps in a richer than normal mixture to make sure the engine starts. Thus, it will then idle faster with EGR valve closed in order to burn up the extra fuel. It'll go back down to 1000 RPM or whatever the engine normally idles at after a few seconds when all the excess fuel's burned up.
If you start the engine and drive, and stops, and shut off, and restarts, engine's already warm, so mixture will NOT be rich, and thus, no fast idle.
If you immediately start and push it into drive, car jumps to drive mode and forgets about the EGR valve. However, that means all the extra fuel will escape, and either increase emissions, or eventually damage your catalytic converter (if you do this a LOT).
You *should* let the car "warm up" any way. If I have time, first time in the morning I start and let the car sit 30 to 60 seconds before shifting it into gear. Not only it reduces emissions, it also gives transmission and other parts a chance to warm up.
2007-09-19 06:04:56 · answer #1 · answered by Kasey C 7 · 0⤊ 0⤋
No problem. When your engine is not at operating temperature, it is going to try to get to operating temperature. Raising the idle will help generate more heat, bringing the temp. up. All computer controlled engines have to have an Ambient Air Temp. sensor. So, when it's cold outside, the computer's going to say "brrr, let's turn up the heat!" Then it may open the idle air control valve, richen the air / fuel mixture, close the cooling circuit, and change valve timing if equipped.
2007-09-19 05:55:17 · answer #2 · answered by Anonymous · 0⤊ 0⤋
2000 rpm's is a little bit high. I would take it in and have them warranty it. Sounds like a sensor may be out of spec. At idle the normal idle speed is around 5-700rpm's Could be a idle air speed sensor or something like that. If it's under warranty and you question it, call the dealer...they shouldn't charge you!
2007-09-19 05:51:26 · answer #3 · answered by ? 1 · 1⤊ 0⤋
i wouldnt worry about it. i have a corolla myself and it starts w/ 2k rpm. when the engine warms it will go down to 1k rpm, as the weather gets colder you should let your engine sit idle for a mintue or two while the engine warms up, its better for the engine to do that. imagine runing without stretching after some time you will start to have problems, same goes with the engine, needs to stretch (warm up)
2007-09-19 05:54:17 · answer #4 · answered by Anonymous · 1⤊ 0⤋
this is not normal guys, all of you with the same prob thinking it is, when its not.. the idle sensor is either dirty or faulting @ some point. Simple fix, and the dealer will fix it don't fall for the valve cover bearings being cold excuse ;)
2007-09-19 06:53:42 · answer #5 · answered by ? 3 · 0⤊ 0⤋
All cars have a "warm up cycle". About 15 minutes. This is normal, no concern.
2007-09-19 05:53:56 · answer #6 · answered by inflamedzero2002 2 · 1⤊ 0⤋
It's doing what it's supposed to do. My Cam. does the same thing.
2007-09-19 05:50:14 · answer #7 · answered by less 6 · 1⤊ 0⤋